Canonical URI: https://w3id.org/kmath/textbook_solution/jihak_solution_body_p110_example_01
| rdf:type | math:TextbookSolution |
|---|---|
| rdfs:label | 지학사 p110 예제 1 풀이 |
| rdfs:comment | 지학사 공통수학1 본문 p110의 예제 1 풀이. |
| math:answerText | \({}_nC_r={}_nC_{n-r}\). |
| math:explanationText | \({}_nC_r=\frac{n!}{r!(n-r)!}\)에서 \(r\) 대신 \(n-r\)를 대입하면 \({}_nC_{n-r}=\frac{n!}{(n-r)![n-(n-r)]!} =\frac{n!}{(n-r)!r!}=\frac{n!}{r!(n-r)!}={}_nC_r\). 따라서 \({}_nC_r={}_nC_{n-r}\)가 성립한다. |
| math:mappingConfidence | 1.0 |
| math:pageStart | 110 |
| math:problem | textbook_problem:jihak_vision_p110_example_01 |
| math:reviewStatus | reviewed |
| math:solutionKind | worked_solution |
| math:usesSolutionPattern | solution_pattern:combination_symmetry |